A lightning bolt produces a rapidly varying magnetic field. If the bolt strikes the earth vertically and acts like a current in a long straight wire, it will induce a voltage in a loop aligned like that in Figure 23.57(b). What voltage is induced in a 1.00 m diameter loop 50.0 m from a 2.00 × 106 A lightning strike, if the current falls to zero in 25.0 μs?

(b) Discuss circumstances under which such a voltage would produce noticeable consequences.